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Relationship between MnS precipitation and respective effects of Ti-Mg bearing inclusions on the induction of intergranular acicular ferrite

  • Xu Chen , Kong Hui , Zhang Mingya and Shan Mengwei
Published/Copyright: April 24, 2019
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Abstract

The role of MnS in the nucleation of intragranular acicular ferrites (IAF) has been explored in Ti-Mg treated steel sample through scanning electron microscope (SEM) and energy dspersive spectrometer (EDS). When compared with a non-treated sample, Ti-Mg treatment evolves from Al-Mn-Si-O inclusion to Ti-Mg bearing inclusion and causes a reduction in pure MnS. In addition to this reduction in pure MnS, a precipitation of MnS around the Ti-Mg bearing inclusion can be observed. Moreover, after etching, it can be found that Ti-Mg bearing inclusions can induce IAF nucleation. Based on EDS line analysis and a comparison with Al-Mn-Si-O inclusion in non-treated sample, this effect can be explained by the presence of an Mn-depletion zone (MDZ) caused by the vacancy property and crystal structure of the inclusion. It should be added, however, that in the same sample, a similarly induced nucleation effect as well as an MDZ have not been observed around pure MnS. This comparison implies that the formation of an MDZ may be independent of MnS precipitation.


*Correspondence Address, Prof. Dr. Kong Hui, School of Metallurgical Engineering, Key Laboratory of Metallurgical Emission, Reduction & Resources Recycling, Anhui University of Technology, Ma'anshan, Anhui, 243002, P. R. China, E-mail: , , ,

Xu Chen, born in 1995, graduated from Anhui University of Technology in 2017 in Metallurgical Engineering. He is currently a postgraduate student at the School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan, Anhui, P R China.

Prof. Dr. Kong Hui, was born in 1980, graduated from the University of Science and Technology of China, He Fei, in Material Physics and Chemistry and received a Doctor's Degree. He currently works as a Professor at the School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan, Anhui, P. R. China.

Associate Prof. Dr. Zhang Mingya, born in 1982, graduated in 2012 from the Northeastern University in Materials Processing Engineering and received his Doctoral Degree. He currently works as an Associate Professor at the School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan, Anhui, P. R. China.

Shan Mengwei, born in 1994, graduated in 2017 from Anhui University of Technology in Metallurgical Engineering. He is currently a postgraduate student at the School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan, Anhui, P R China.


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Published Online: 2019-04-24
Published in Print: 2019-02-04

© 2019, Carl Hanser Verlag, München

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